Hearing aid



FIG. 1 is a front perspective view of a hearing aid, showing our new design;

FIG. 2 is a side elevation thereof;

FIG. 3 is a rear perspective thereof;

FIG. 4 is a plan view of the rear thereof;

FIG. 5 is a rear perspective as seen from an alternate position of FIG. 3;

FIG. 6 is an elevation as seen from the side opposite FIG. 2;

FIG. 7 is a front perspective as seen in an alternate position of FIG. 1;

FIG. 8 is a front elevation thereof;

FIG. 9 is a side elevation thereof; and

FIG. 10 is an elevation as seen from the side opposite FIG. 9. 

The ornamental design for a hearing aid, as shown. 